Ferroelectric liquid crystal device with specific pitch in each of a cholesteric and a smectic phase
US5046830A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1991 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Jan 28, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/0225
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A ferroelectric liquid crystal device, in which orientation is applied for either one of both or two substrates having transparent electrodes formed thereon for arranging the liquid crystal molecules in parallel with the substrate and a ferroelectric crystal is filled into the gap between two sheets of the substrates, wherein the ferroelectric liquid crystal has a helical texture pitch in the smectic phase not less than 1 um and not greater than 3.5 micrometers, while having a pitch in the cholesteric phase of not less than 25 micrometers. Also, the length of the gap between the substrates ranges from 6 to 13 micrometers. The light scattering type liquid crystal device capable of storing the state of display and displaying a large picture area at high contrast can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.